package org.apidesign.apifest08.currency;

 import java.math.BigDecimal;

 import java.math.RoundingMode;

 import java.util.Currency;

 import static org.apidesign.apifest08.currency.Assert.*;

 /**

  * An amount representation. Amount is represented as composition of a value and 

  * a currency.

  */

 public final class Amount {

 	private final BigDecimal value;

 	private final Currency currency;

 	private final int scale;

 	private final RoundingMode roundingMode;

 	public static final RoundingMode DEFAULT_ROUNDING = RoundingMode.HALF_EVEN; 

 	public Amount(final BigDecimal value, final Currency currency) {

 		notNull(value, "value");

 		notNull(currency, "currency");

 		this.value = value;

 		this.currency = currency;

 		this.scale = currency.getDefaultFractionDigits();

 		this.roundingMode = DEFAULT_ROUNDING;

 	}

 	public Amount(final BigDecimal value, final Currency currency, final RoundingMode roundingMode) {

 		notNull(value, "value");

 		notNull(currency, "currency");

 		notNull(roundingMode, "roundingMode");

 		this.value = value;

 		this.currency = currency;

 		this.scale = currency.getDefaultFractionDigits();

 		this.roundingMode = roundingMode;

 	}

 	public Amount(final long value, final Currency currency) {

 		this(BigDecimal.valueOf(value), currency);

 	}

 	public Amount(final String value, final Currency currency) {

 		this(new BigDecimal(value), currency);

 	}

 	/**

 	 * @return the value with scale of the associated currency and rounded by 

 	 * the rounding mode. 

 	 */

 	public BigDecimal getValue() {

 		return value.setScale(scale, roundingMode);

 	}

 	/**

 	 * @return the raw (no explicit scale, no explicit rounding) value 

 	 */

 	public BigDecimal getRawValue() {

 		return value;

 	}

 	public Currency getCurrency() {

 		return currency;

 	}

 	public int getScale() {

 		return scale;

 	}

 	public RoundingMode getRoundingMode() {

 		return roundingMode;

 	}

 	@Override

 	public String toString() {

 		return value + ",- " + currency.toString();

 	}	

 }